// 文件上传工具
const app = getApp()

/**
 * 上传文件到服务器
 * @param {string} filePath 文件路径
 * @param {string} fileType 文件类型 image/video/audio
 * @param {function} onProgress 上传进度回调
 * @returns {Promise} 返回上传结果
 */
function uploadFile(filePath, fileType = 'image', onProgress = null) {
  return new Promise((resolve, reject) => {
    const uploadTask = wx.uploadFile({
      url: app.globalData.baseUrl.replace('/graphql', '/upload'), // 假设有文件上传接口
      filePath: filePath,
      name: 'file',
      formData: {
        'type': fileType,
        'token': app.globalData.token
      },
      header: {
        'Authorization': app.globalData.token ? `Bearer ${app.globalData.token}` : ''
      },
      success: (res) => {
        try {
          const data = JSON.parse(res.data)
          if (data.success) {
            resolve({
              url: data.url,
              fileId: data.fileId,
              fileName: data.fileName
            })
          } else {
            reject(new Error(data.message || '上传失败'))
          }
        } catch (e) {
          reject(new Error('上传响应解析失败'))
        }
      },
      fail: (err) => {
        reject(err)
      }
    })

    // 监听上传进度
    if (onProgress && typeof onProgress === 'function') {
      uploadTask.onProgressUpdate((res) => {
        onProgress(res.progress)
      })
    }
  })
}

/**
 * 选择并上传图片
 * @param {object} options 选择图片选项
 * @param {function} onProgress 上传进度回调
 * @returns {Promise} 返回上传结果
 */
function chooseAndUploadImage(options = {}, onProgress = null) {
  return new Promise((resolve, reject) => {
    wx.chooseImage({
      count: options.count || 1,
      sizeType: options.sizeType || ['original', 'compressed'],
      sourceType: options.sourceType || ['album', 'camera'],
      success: (res) => {
        const tempFilePaths = res.tempFilePaths
        
        if (tempFilePaths.length === 1) {
          // 单个文件上传
          uploadFile(tempFilePaths[0], 'image', onProgress)
            .then(resolve)
            .catch(reject)
        } else {
          // 多个文件上传
          const uploadPromises = tempFilePaths.map(filePath => 
            uploadFile(filePath, 'image', onProgress)
          )
          
          Promise.all(uploadPromises)
            .then(resolve)
            .catch(reject)
        }
      },
      fail: reject
    })
  })
}

/**
 * 选择并上传视频
 * @param {object} options 选择视频选项
 * @param {function} onProgress 上传进度回调
 * @returns {Promise} 返回上传结果
 */
function chooseAndUploadVideo(options = {}, onProgress = null) {
  return new Promise((resolve, reject) => {
    wx.chooseVideo({
      sourceType: options.sourceType || ['album', 'camera'],
      maxDuration: options.maxDuration || 60,
      camera: options.camera || 'back',
      success: (res) => {
        uploadFile(res.tempFilePath, 'video', onProgress)
          .then(resolve)
          .catch(reject)
      },
      fail: reject
    })
  })
}

/**
 * 预览图片
 * @param {string} current 当前显示图片的链接
 * @param {array} urls 需要预览的图片链接列表
 */
function previewImage(current, urls = []) {
  wx.previewImage({
    current: current,
    urls: urls.length > 0 ? urls : [current]
  })
}

/**
 * 保存图片到相册
 * @param {string} filePath 图片路径
 * @returns {Promise}
 */
function saveImageToPhotosAlbum(filePath) {
  return new Promise((resolve, reject) => {
    wx.saveImageToPhotosAlbum({
      filePath: filePath,
      success: resolve,
      fail: reject
    })
  })
}

/**
 * 获取文件信息
 * @param {string} filePath 文件路径
 * @returns {Promise}
 */
function getFileInfo(filePath) {
  return new Promise((resolve, reject) => {
    wx.getFileInfo({
      filePath: filePath,
      success: resolve,
      fail: reject
    })
  })
}

/**
 * 压缩图片
 * @param {string} src 图片路径
 * @param {number} quality 压缩质量，范围0-100
 * @returns {Promise}
 */
function compressImage(src, quality = 80) {
  return new Promise((resolve, reject) => {
    wx.compressImage({
      src: src,
      quality: quality,
      success: resolve,
      fail: reject
    })
  })
}

module.exports = {
  uploadFile,
  chooseAndUploadImage,
  chooseAndUploadVideo,
  previewImage,
  saveImageToPhotosAlbum,
  getFileInfo,
  compressImage
}